Gas-engine



4 s. LAWSON.

GAS ENGINE.

APPL1cAT1oN-f|LEn APR. 9. 1911.w

1,367,320. Patented Feb. 1, 1921.

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WT/VESS.' /NVENT lll/ll', W A O s. LAWSON.

GAS ENGINE.

APPLICATION FILED APH. 9, ISI?.

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UNITED STATES PATENT OFFICE.

GAS-ENGINE.

Application led April 9, 1917.

To (all whom t may concern,

lie it known that l, SAMUEL Lawson, a citizen of the UnitedStates,residing in 'Uroton-on-Hudson, in the county of Westchester and State ofNew York, have invented an Improvement in Gras-Engines, of which thefollowing is a specification.

'lhis invention relates to internal combustion 'engines inthe classdesignated as gas engines, and more particularly to the valves employedin this type of engine to admit the explosive mixture to the cylindersof the engine and to permit the exhaust gases to escape therefrom. Thevalve made in accordance with my present invention is a tubular valveand is so constructed and employed with the required ports in the headof the engine as to serve as a unitary structure for the admission andexhaust valve for a plurality of cylinders.

l am aware that heretofore various forms of cylindrical valves havelbeen employed in gas engines. For example. disk valvesA have been usedto admit the explosive mixture to engine cylinders and to permit theescape of the exhaust gases therefrom, such disk valves being placed ina valve casing* se cured on the he d of the engine cylinders. Thesecylindriea valves have also been so constructed as to surround one endof the cylinder of the engine and to be inclosed in a valvecasingadapted to contain theA same, both these types of valve being;actuated by suitable mechanism driven from the main shaft of the engine.In these instances however, as well as all others to which my attentionhas been directed it has been customary and so far as l am awareo beenconsidered necessary to employ a separate valve for each individualcylinder. The main object therefore of this invention is to employ aunitary valve and a casing therefor so constructed1 as hereinbeforestated. that the valve is adapted to admit an explosive mixture and topermit the escape of the exhaust gases from a plurality of cylinders,and the invention will be hereinafter more particularly described inconnection with the accornpanyingr drawings.

ln the drawings,

Figure 1 is a plan and partial cross section of a gras engine made inaccordance with my invention.

Fin". 2 is a cross section taken on line 2-2,

Specification of Letters Patent.

Patented Feb. 19 1921..

Serial No. 160,724.

Fig. 3 is a cross section taken on line 3-53, Fig. 2, and

. Fig. 4 is a perspective view of the tubular valve.

In these drawings l have illustratmlV and will hereinafter describe myinvention as applied to a two cylinder engine although as will beunderstood, the form of valve to which this invention relates may beequally well adapted. for usein an engine having any desired number ofcylinders. i

In the drawings lO'indicates a bed plate upon which the engine rests andwhich is provided with a frame 11 extending up,- wardly therefrom tosuitably support the engine cylinders 12 and 13 which will be understoodare suitably secured in the frame. This however.l may be done in anydesired manner and forms no part of the present invention.

-The cylinders 12 and 13 are provided with a cylinder head 14 which ispreferably cornmon to both the cylinders and is secured in positionthereon by means of tie-bolts 15 which as indicated in the drawing" andparticularly in Figs. 2 and 3 pass through the chamber 16 for thecirculation of a .suitable cooling medium through the walls of theengine cylinder. As is usual each of these cylinders is provided with apiston. the one in the cylinder 12 being; indicated at 1T, and isprovided with suitable packing` rings ld as is also customary. ln thisas well as in the other pistons employed, there is a pin 19 by which thepiston is connected through a rod 20 to the drive shaft 21 of theengine.

The cylinder head and valve case 14- Aisv also provided with suitablepassages 22 and 23 for the circulation of a cooling medium and thesepassages may be connected to or inde pendent of the passages 16 in thewalls of the engine cylinder. The cylinder head 14 is also provided withsuitable tapped openings 24 and 25 for the reception of suitable sparkplugs for thei cvlinders 12 and 13 respectively. Centrally the cylinderhead 14 also includes a valve case 26 inclosing; a chamber for thereception and operation of the valve hereinafter described. Also in thiscylinder head and making; connnunication between the valve chamber andthe re spective cylinders. there are intake and cir haust passages. Theintake passage to the cylinder 1Q is indicated at Q7 while 'the intakepassage to the cylinder 13 is indicated lllll at 28. The exhaust passagefrom the cylinder 12 is indicated at 29, and the exhaust passage fromthe cylinder 13 is indicated at 30.

Within the valve casing 26 I employ a tubular valve indicatedat 31. Thisvalve centrally is provided with a transverse partition 32 dividing thesame in this instance into an inlet chamber 33 and an exhaust chamber34. In the Walls of the valve embracing the inlet chamber there is anintake port 35, and in the Walls of the valve embracing the exhaustchamber there is an exhaust port 36. Adjacent one end the valve isprovided with a fiange 37 having a circular recess on its inner faceadapted to receive the packing 38. This flange and packing in the use ofthe valve abut against the adjacent sider of the head of the -cylinderas clearly indicated in Figs. 1 and 3. The opposite end of the valve ispreferably of reduced diameter as indicated at 40 providing a shoulder41 between the main portion of the valve and this reduced end thereof.This end of the valve lits Within an inlet nozzle 42 suitably secured tothe cylinder head and having an inlet. connect-ion 43, with which aninlet port 43 in the valve is adapted to register during the revolutionof the valve Within its casing.

This valve is geared to the main or drive shaft of the engine so as toturnk once to every two revolutions of .the drive shaft. As indicated inthe drawing, the reduced end of the valve is fitted with a spiral gear44 which is secured in position thereon by a pin 45 or otherwise. Thisgear 44 meshes with a similar gear 46 secured on a shaft 47 by a key 48or otherwise and on which shaft there is also a gear meshing with a gearon an arbor 49'. The gear 49 meshes with a worm 50 secured on Aa shaft51 Which also carries a worm 52 meshing with a gear 53 on the main ordrive shaft of the engine, it

being understood that While I have herein describedthe use of spiralgears for driving the valve, any' other suitable mechanism may beemployed for this purpose, Without departing from the nature and spiritof my invention.

The engine Ahereinbefore described is a four cycle apparatus as iscustomarily used in engine practice at the present time; that is to sayin each cylinder there is an admission stroke, a compression stroke, anexplosion stroke, and an exhaust stroke. For the purposes of explainingthe operation of the valve it will be assumed that the piston in thecylinder 12 is at the beginning of the intake stroke'and that the pistonin the cylinderl is at the beginning of the exhaust stroke, and byreference to the drawing. it will be seen that the inlet port 35 isabout to open to the passage 27 to admit the explosive mixture into thecylinder 12 and the exhaust port 36 is about to open to the exhaustpassage 30 in the cylinder 13. During these strokes of these pistons.these ports remain open, that is the port. il?) opens the inlet chamberto the passage 21T. and the port 36 opens the passage 3l) to the exhaustchamber 34. During the next quarter revolution of the main shaft andduring the intake stroke of the piston in the cylinder 1Jl. the port isopen to the passage 2S leading to the cylinder 13. ln this stroke alsoas 'will be understood, the compression takes Were assumed to begin thecycle or that shown in the figures of the drawing. Furtherrnore` as willbe understood. the intake port 43 is of such an extent that the passageof the intake through the nozzle 42 is open from any suitable source ofsupply. during the entire period. when in the revo lution of the tubularvalve. the lsame is passing from the intake position to the cylinder 12through the intake position to the cylinder 123. lt will also beunderstood that a suitabole exhaust pipe`l Sli) may he connected to thetubular valve so as to convey the exhaust gases from the exhausttherein.

I claim as my invention:

l. In a gas engine. a pair of cylinders. a valve casing. a tubularrotating valve having an intake chamber and an exhaust chaui bertherein. there being a single intake porty in the Walls of the valveinclosing the intake chamber 'l'or supplying both said cylinders.y asingle exhaust port in the walls ol`- the valve inclosing the exhaust:chamber for exhausting both said cylinders, and a port in the Walls ofthe valve inclosing the intake chamber for the admission of an explosivemixture to the said intake chamber which latter named port is open to asupply passage in said valve casing during the time the said intake portis opened to both the said cylinders and closed at other times duringthe revolution of the valve.

In a gas engine, a pair of cylinders, a valve casing, a tubular rotatingvalve closed at one end and provided approximately centrally with atransverse partition Wall dividing the same into an intake chamber andau exhaust chamber, there being ar single intake port in the Walls ofthe valve inclosing the intake chamber for supplying both saidcylchamber fili lltl

inders, a single exhaust port in the Walls ofI the valve inclosing theexhaust chamber for discharging both said cylinders, and a port adjacentthe closed end of the valve for the admission of an explosive mixture tothe said intake chamber, which last named port is open to a supplypassage in said valve casing from the time the said intake port isopened to one cylinder' until it is closed to the other cylinder and isclosed at all other times during the revolution of the valve.

3. `Ina gas engine, a pair of cylinders, a valve casing secured to thesaid cylinders and common to both of the .same and having an intake andan exhaust port communicating with each cylinder, and a tubular rotatingvalve having an intake chamber andan exhaust chamber therein, therebeing a single intake port in the Walls of thevalve inclosw ing theintake chamber for supplying both said cylinders, a single exhaust portin the Walls of the valve inclosing the exhaust chamber for exhaustingboth said cylinders, and a port in the Walls of the valve inclosing theintake chamber for the admission of an explosive mixture to the saidintake chamber, which latter named port is open to a supply passage insaid valve casing during the tlme the said intake port is opened to boththe said cylinders and closed at other times during the revolution ofthe valve.

4. In a gas engine, a pair of cylinders, a cylinder head and valvecasing secured to said cylinders and common to both of the same andhaving an intake passage to each cylinder and an exhaust passage fromeach cylinder, and a tubular rotating valve closed at one end andprovided approximately centrally with a transverse partition walldividing the same into an intake chamber and an exhaust chamber, therebeing an intake port in the Walls of the valve surrounding the intakechamber adapted to register with the passages in the cylinder head andvalve casing communicating with said cylinders, a single exhaust port inthe Walls of the valve surrounding the exhaust chamber therein adaptedto register with the passages in the cylinder head and valve case whichlead from the said cylinders, and a port adjacent the closed end of thevalve for admitting an explosive mixture to the said intake chamber inthe valve, which last aforesaid port is open to a supply passage in saidvalve casing from the time the intake port is opened to one cylinderuntil the intake port is closed to the other cylin der and is closedduring the entire remainder of the revolution of the valve.

5, In a gas engine, a pair of cylinders, a cylinder hea-d and valve casesecured to said cylinders and common to both of Ithe same and having anintake passage to each cylinder and an exhaust passage from each cylinder, a tubular rotating valve closed at one end and providedapproximately centrally with a transverse partition wall dividing thesame into an intake chamber and an exhaust chamber, there being anintake port in the Walls of the valve surrounding the intake chamberadapted to register with the passages in the cylinder head and valvecasing communicating with said' cylinders, a single exhaust port in theWalls of the Valve surrounding the exhaust chamber therein adapted toregister with the passages in the cylinder head and valve case whichlead from the said cylinders, an inlet nozzle associated with thecylinder head and valve case, a bearing Jforming part of said inletnozzle, and a reduced end part extending from the closed end of thevalve and passing through and being journaled in the 4said bearing,there being a port adjacentthe closed end of the said valve adapted toregister with the passage in the inlet nozzle. which last aforesaid portis open to the inlet nozzle from the time the inlet port is opened toone cylinder until it is closed to the other cylinder and closed at allother times during the revolution of the valve.

Signed by me this Llth day of April, 1917.

SAMUEL LAWSON

